Spigen SGP or Zagg for iPhone 5

I just got a new iPhone 5. I am debating between Spigen SGP and Zagg for a screen protector. I have used Zagg before and had generally decent results. This time around I don't think I want to pay the hefty price plus I am not crazy about the die cut of their latest screen protector. Has any one used Spigen SGP before? I have been seeing them mentioned on various forums. How do they compare to Zagg?